Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 21, Pages 14754-14761Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c03375
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Funding
- National Natural Science Foundation of China [11904214, 21701102, 11804200]
- Natural Science Foundation of Shandong Province [ZR2019YQ09]
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Unstable detection environment is one of the biggest interferences for in situ surface-enhanced Raman spectroscopy (SERS) using in real-time monitoring of toxic pollutants, leading to unreliable results. To address this problem, we have designed and prepared a cavity-based particle-in-quasicavity (PIQC) architecture composed of hierarchical ZnO/Ag nanosheets and nanoprotrusions for improving the in situ SERS performance under a liquid environment. Benefitting from the special cascaded optical field mode, the PIQC ZnO/Ag exhibits excellent in situ SERS detectability, with 10(-18) M of limit of detection for rhodamine 6G and 12.8% of signal relative standard deviation value. Furthermore, by means of a microfluidic chip, this PIQC structure is proved to have the quantitative analysis feasibility and realizes real- time monitoring of the 3,3', 4,4'-tetrachlorobiphenyl, a representative global environmental hazard, under the flowing environment. The strategy in this paper provides a brand new idea to promote the application of in situ SERS in contaminant monitoring and is also instructive for light control in other optical fields.
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